Milling cutter and head.



No. 833,261. I PATENTED OCT. 16, 1906.

O. B. TARDIF.

MILLING CUTTER AND HEAD. APPLIGATION FILED NOV.21,1905.

2 SHEETS-SHEET 1.

PATENTED OCT. 16, 1906.

G. B. TARDIP.

MILLING CUTTER AND HEAD.

APPLIGATION FILED NOV. 21, 1905.

2 SHEETS-SHEET 2.

MTJESEE 5:

UNITED sTATEs PATENT oEEIoE.

CHARLES B. TARD-IF, OF CONCORD, NEW HAMPSHIRE.

MILLING CUTTER AND HEAD.

Specification of Letters Patent.

Patented Oct. 1 6. 190 6.

A li ati filed November 21 1.905. Serial No. 288,388.

To all whom it may concern' Be it known that 1, CHARLES B. TARDIF, a citizen of the United States, residing'in Concord, in the'county of Merrimack and State of New Ham shire, have invented certain new and usefuFImprovements in Milling Cutters and Heads, of which the following is a specification.

This invention relates to that class of milling cutters and heads in which a bored head adapted to fit on the spindle of a milling-niachine is provided with a plurality of individual cutters arranged in gangs.

My invention consists in the novel, construction and arrangement of parts hereinafter described, and illustrated in the accompanying drawings, whereby the cutter-blocks and cutters are easily removedfrom the head when the cutters become worn andreplaced by others or reground and returned to their positions, and whereby the device is rendered more durable and efficient in its operation. I

In the drawings, in which similar letters of reference indicate corresponding parts, F igure 1 is a side elevation of my improved device. Fig. 2 is a view of one of the cutters removed. Fig. 3 is a view of one of the blocks removed. Fig. 4 is a view of a modification comprising a double block. Fig. 5 is an end elevation of a portion of, the left or outer end of the device. Fig. 6 is a cross vertical section. Fig. 6 represents a sectional detail illustrating a cutter which has become worn and has'been underlaid in order tolift it to the proper point. Fig. 7 is a view of a row of cutters and cutter-blocks and the adjacent parts of the holder. Fig.8 is an elevation of a row of cutters and cutter-blocks with the adjacent parts of the holder in section.

a represents a cylindrical metallic head, the central'hole b in which is adapted, by means ofa suitable groove 0, to be a plied to the spindle of a millmg-machine. he outer end of the head has secured to it b means of screws cl a ring-shaped plate 6, w ose outer edge is flush with the surface of the head. The cutter-head is rovided with parallel rows of diagonal and ap roximately' spiral peripheral grooves f, an in these grooves "utters g are set radially, each cutter being lisposed with its dia onally opposite corners next opposite sides 0 the groove in which it s located. Between the cutters are airs of fectangular bloc-ks h of equal size, eac block back or longer side of having its outer surface preferably curved to conform to the curvature of the surface of the head a,,the depth of each block being uniform with the depth of the grooves f and each block being oppositely beveled at its ends. The each block is provided with a longitudinal rib It, which fits in a longitudinal groove Z in one side of the groove f, each side being provided with a groove Z, and the blocks which constitute a pair are set with their shorter ends facing each other, whereby a pair of space between two adjacent cutters and fit against said cutters. The cutters in each row or gang are thus separated from each other and at even distances apart by pairs of blocks. At'the opposite ends of each row of cutters blocks m are placed, each being of suitable width to extend across its groove f, and the inner end of each block being notched to fit against the outer end of the cutter at that end of the row. Set-up screws n extend through correspondingly-threaded holes in the plate e against the outer blocks m and hold the blocks and cutters in each row snu ly together, thus enabling the blocks to hol the cutters firmly in position, the blocks being held in osition by means of the ribs 7c and grooves From the main portion or shank of each cutter g the knife or cutting edge 9 extends, said ed e bein suitably placed to perform its wor and the ortion 9 being preferably of approximate y onehalf the thickness of the main portion or shank g. I

To remove any cutter for any purpose, the screw 11, which sets against the row or gang containing said cutter, is simply loosened, and

another cutter can besubstituted by dropping it into place. If a cutter has become worn, it can here round into a rectangular shape and again pl aced in position, a perfect fit being secured by underlaying it by means of a small block or layer s, of metal. By setting the cutters withtheir corners next the walls of the grooves f and by beveling the blocks h to fit the other corners of the cutters it becomes ossible to produce an exceedingly strong ictional hold on the cutters by setting up the screws n. It is evident that blocks of the shape shown in Fig. 4 canbe used in place of the pairs of blocks shown in the other figures with the same eneral effect. Preferably the cutters in eadh gang or row are set opposite the spaces between the cutters in the adjacent gangs or rows.

blocks completely fill the Patent, is

3. In a device of the character described, a cylindrical cutter-head provided with a series of substantially parallel peripheral of the character described, a grooves; independent gangs or rows of cutters, each cutter consisting of a shank rectangular in cross-section and an operating or cutting end extending from one side of Having thus fully described my invention, whatI claim, and desire to secure by Letters 1. Ina device 0 lindrical cutter-head provided with perlpheral grooves; independent gangs or rows of cutters, each an r being set in one of said grooves; cutter-blodhs set between the cuti said shank, each gang being set in one of said ters in each row; means for locking said cutgrooves, and I the individual cutters being ter-blocks in position in the grooves; and disposed with their diagonaloppositecorners mechanism adapted to be set against the 1 next the opposite sides of the grooves; pairs outer ends of the different rows, of cutters of cutterocks beveled to' correspond in and blocks whereby the cutters and blocks I shape with the corners of the shanks of the in each row are held in position by friction, cutters, one pair of blocks being set face to for the pur ose set forth. face in the groove 2. In a evice ofthe character described, a l ters; cutter-blocks cylindrical cutter-head provided with a segrooves and extending across the grooves in ries of peripheral grooves; independent the cutter-head at the opposite ends of the gangs or rows of cutters having substantially I rows of cutters and fitting against the outer rectangular shanks; e'ach gang being set in cutter in "each row; means for locking the one of said grooves, and the individual cut- '1 blocks into engagement yvith the sides of the ters being disposed with their diagonally grooves; and set-up screws bearing against opposite corners next the opposite sides of the outer ends of the rows of cutters and the groove; cutter-blocks set alternately blocks, for the pu ose set forth. with the cutters in each row, said blocks be- In testimony w ereof I have signed my ing of shape to fit the cutter-heads between name to this specification in the presence of :lhicih they are placed; means for-lockirilg tiile I two subscribing witnesses.

00 s slidi'ngy into en agement wit t e sides of the grooves; am set-up mechanism CHARLES TARDIF' for bearing against the outer ends of the difl ferent rows of cutters and blocks, for the I purpose set forth.

Witnesses:

EMMA A. RoBINsoN, ELWIN L. PAGE.

between each pair of cutj provided with V-shaped 

